Don't know why but i was answer "y" when Nginx upgrade asks for checking yum install checks and i was found that error at the middle of the process so i am reporting it here in case that it will need a fix

Code:

Installing libtidy
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http://epel.mirrors.ovh.net/epel/7/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
http://epel.mirrors.ovh.net/epel/7/x86_64/repodata/0dfed68db59f5bcd293c257e46c29c1197c6586ff868739f447f02477084d205-updateinfo.xml.bz2: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
To address this issue please refer to the below knowledge base article
https://access.redhat.com/articles/1320623
If above article doesn't help to resolve this issue please create a bug on https://bugs.centos.org/